Comment on “an order-disorder model for the alloy NiPt”

✍ Scribed by L. Guttman

• Publisher: Elsevier Science
• Year: 1965
• Weight: 280 KB
• Volume: 13
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(65)90152-5

✦ Synopsis

or orientation. This lattice invariant shear can occur by slip or twinning. If the lattice invariant shear occurs by slip it is not clear whether it occurs in the parent lattice, product lattice, or at an intermediate stage. The presence of sessile inherited dislocations would certainly inhibit lattice invariant shear by slip in martensite. This would favor the alternate mode of shear by twinning. This may explain the observation that ausforming promotes twinned marten-sit0.c3) While the dislocations with Burgers vectors of the type 6, = a(lOO),, are not sessile in a geometrical sense, they are not considered common slip dislocations in the b.c.c. crystal. These dislocations are commonly observed in b.c.c. metals and are believed to be the result of dislocation reactions in the formation of a network.c4) While there is some evidence that dislocations of this type are mobile at high temperatures.(5) these dislocations are usually considered sessile.c6) Sessile dislocations with Burgers vector b, = a(lOO), doubtless impede the movement of mobile dislocations because of intersection effects. If inherited dislocations of the type 6, = a(lOO)M are sessile and if plastic deformation must be provided by the eight variants of the glissile inheritzd dislocations of the type 6, = a/2(111),,